Staggered Start - Power-Safe Warmup Scheduling for 3D Print Farms

Staggered Start caps how many printers begin warming up at the same time. When a group of machines shares a power circuit, a rack, or a PDU, sending them all to full bed and nozzle temperature at once can trip a breaker or brown out the rack. Staggered Start spreads that surge out: only a set number of printers in a group heat up concurrently, and the rest start automatically as slots free. You get to pack more printers onto the same electrical infrastructure without babysitting the breaker panel.

It Works at the Queue, Not the Hardware

Staggered Start gates production at the moment a job is matched to a printer, not by pausing machines. A job only matches a printer if that printer's group has a free warmup slot. Jobs that would exceed the group's limit simply stay in the queue as pending until capacity opens, so nothing is ever parked in a half-started state and a running print is never interrupted. The queue stays honest, and your power stays safe.

How a Slot Moves Through the Group

Every warmup slot follows the same three steps.

1. Reserve at match. When the queue matches a job to a printer, Printago reserves a warmup slot in that printer's group. It counts against the group's limit immediately, even before the file is sent, so slicing dead time can never over-commit the group.
2. Warm at send. Once the job is actually sent, the release clock starts. The printer heats toward its target while it holds the slot.
3. Release when the rules are met. The instant the group's release rules are satisfied, or the fallback timeout is reached, the slot frees and the next waiting printer starts.

Release Rules That Fit Your Reality

You decide what "warmed up enough to free the slot" means. Each of bed temperature and nozzle temperature can be set independently to one of three modes:

• Fixed temperature. Release once the component reaches an exact temperature you enter, for example 55 degrees Celsius.
• First layer temp. Release once the component reaches the first-layer temperature detected from the sliced job's own G-code, so the rule follows each job's material instead of a hard-coded number.
• Disabled. Leave a component out of the decision entirely.

When both bed and nozzle rules are enabled, both must be satisfied. On top of that, a fallback timeout is a guaranteed backstop measured in minutes. If a heater misbehaves and the temperature rules never fire, the timeout releases the slot so one stuck warmup cannot freeze the whole group.

Real-Time Release, Not Just Polling

Staggered Start frees a slot the moment a printer actually reaches temperature. For printers connected through Printago Fuse, the release fires on the temperature crossing itself, usually within a fraction of a second, so the next machine in line starts almost immediately instead of waiting on a scheduled check. A periodic check still runs underneath as a permanent backstop, covering every printer and every edge case, so a slot is always released even if a single update is missed.

Multi-Nozzle and Toolchanger Aware

For machines with more than one hotend, such as the Bambu Lab H2D or a Snapmaker toolchanger, the nozzle rule tracks the currently active nozzle and the bed rule tracks the single build plate. Because the startup surge is dominated by the bed and the first active hotend, this is exactly the right thing to watch to keep the circuit safe.

Simple to Set Up, Explicit by Design

Open Settings, choose Staggered Start, and add a group. Group membership is explicit, so bulk printer-tag edits never quietly change your power behavior, and a printer belongs to at most one group. Pick the printers that share a constraint, set how many may warm up at once, and choose your release rules. A concurrency of one starts the printers strictly one after another; a higher number allows that many simultaneous warmups. Extra printers queue and start automatically as slots free.

See Every Warmup at a Glance

The Active holds view lists every warmup slot in use in real time. Each row shows the printer, its live progress toward the release rules, and an estimate of when the fallback timeout would release the slot. You can release any hold manually the instant you need the slot back. Releasing frees capacity for the next queued printer and, as always, never stops a print that is already running.

Built for Lights-Out Farms

Staggered Start pairs naturally with continuous, unattended production. Run FabMatic to chain jobs back to back overnight, and let Staggered Start make sure the wave of restarts never overwhelms your power. Together they let you scale a farm on the electrical infrastructure you already have, safely and automatically, whether you run on the hosted Cloud Platform or the self-hosted edition.